<?php // $Id: delete_index.class.php,v 1.5 2007/10/10 05:25:20 nicolasconnault Exp $

///////////////////////////////////////////////////////////////////////////
//																	   //
// NOTICE OF COPYRIGHT												   //
//																	   //
// Moodle - Modular Object-Oriented Dynamic Learning Environment		 //
//		  http://moodle.com											//
//																	   //
// Copyright (C) 1999 onwards Martin Dougiamas		http://dougiamas.com  //
//		   (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com  //
//																	   //
// This program is free software; you can redistribute it and/or modify  //
// it under the terms of the GNU General Public License as published by  //
// the Free Software Foundation; either version 2 of the License, or	 //
// (at your option) any later version.								   //
//																	   //
// This program is distributed in the hope that it will be useful,	   //
// but WITHOUT ANY WARRANTY; without even the implied warranty of		//
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the		 //
// GNU General Public License for more details:						  //
//																	   //
//		  http://www.gnu.org/copyleft/gpl.html						 //
//																	   //
///////////////////////////////////////////////////////////////////////////

/// This class will delete completely one index

class delete_index extends XMLDBAction {

	/**
	 * Init method, every subclass will have its own
	 */
	function init() {
		parent::init();

	/// Set own custom attributes

	/// Get needed strings
		$this->loadStrings(array(
			'confirmdeleteindex' => 'xmldb',
			'yes' => '',
			'no' => ''
		));
	}

	/**
	 * Invoke method, every class will have its own
	 * returns true/false on completion, setting both
	 * errormsg and output as necessary
	 */
	function invoke() {
		parent::invoke();

		$result = true;

	/// Set own core attributes
		$this->does_generate = ACTION_GENERATE_HTML;

	/// These are always here
		global $CFG, $XMLDB;

	/// Do the job, setting result as needed

	/// Get the dir containing the file
		$dirpath = required_param('dir', PARAM_PATH);
		$dirpath = $CFG->dirroot . stripslashes_safe($dirpath);
		$tableparam = required_param('table', PARAM_PATH);
		$indexparam = required_param('index', PARAM_PATH);

		$confirmed = optional_param('confirmed', false, PARAM_BOOL);

	/// If  not confirmed, show confirmation box
		if (!$confirmed) {
			$o = '<table width="60" class="generalbox" border="0" cellpadding="5" cellspacing="0" id="notice">';
			$o.= '  <tr><td class="generalboxcontent">';
			$o.= '	<p class="centerpara">' . $this->str['confirmdeleteindex'] . '<br /><br />' . $indexparam . '</p>';
			$o.= '	<table class="boxaligncenter" cellpadding="20"><tr><td>';
			$o.= '	  <div class="singlebutton">';
			$o.= '		<form action="index.php?action=delete_index&amp;confirmed=yes&amp;postaction=edit_table&amp;index=' . $indexparam . '&amp;table=' . $tableparam . '&amp;dir=' . urlencode(str_replace($CFG->dirroot, '', $dirpath)) . '" method="post"><fieldset class="invisiblefieldset">';
			$o.= '		  <input type="submit" value="'. $this->str['yes'] .'" /></fieldset></form></div>';
			$o.= '	  </td><td>';
			$o.= '	  <div class="singlebutton">';
			$o.= '		<form action="index.php?action=edit_table&amp;table=' . $tableparam . '&amp;dir=' . urlencode(str_replace($CFG->dirroot, '', $dirpath)) . '" method="post"><fieldset class="invisiblefieldset">';
			$o.= '		  <input type="submit" value="'. $this->str['no'] .'" /></fieldset></form></div>';
			$o.= '	  </td></tr>';
			$o.= '	</table>';
			$o.= '  </td></tr>';
			$o.= '</table>';

			$this->output = $o;
		} else {
		/// Get the edited dir
			if (!empty($XMLDB->editeddirs)) {
				if (isset($XMLDB->editeddirs[$dirpath])) {
					$dbdir =& $XMLDB->dbdirs[$dirpath];
					$editeddir =& $XMLDB->editeddirs[$dirpath];
					if ($editeddir) {
						$structure =& $editeddir->xml_file->getStructure();
					/// Move adjacent indexes prev and next attributes
						$tables =& $structure->getTables();
						$table =& $structure->getTable($tableparam);
						$indexes =& $table->getIndexes();
						$index =& $table->getIndex($indexparam);
						if ($index->getPrevious()) {
							$prev =& $table->getIndex($index->getPrevious());
							$prev->setNext($index->getNext());
						}
						if ($index->getNext()) {
							$next =& $table->getIndex($index->getNext());
							$next->setPrevious($index->getPrevious());
						}
					/// Remove the index
						$table->deleteIndex($indexparam);

					/// Recalculate the hash
						$structure->calculateHash(true);

					/// If the hash has changed from the original one, change the version
					/// and mark the structure as changed
						$origstructure =& $dbdir->xml_file->getStructure();
						if ($structure->getHash() != $origstructure->getHash()) {
							$structure->setVersion(userdate(time(), '%Y%m%d', 99, false));
							$structure->setChanged(true);
						}
					}
				}
			}
		}

	/// Launch postaction if exists (leave this here!)
		if ($this->getPostAction() && $result) {
			return $this->launch($this->getPostAction());
		}

	/// Return ok if arrived here
		return $result;
	}
}
?>
